Clock



FIG. 1 is a front quarter perspective view of the clock design of the invention;

FIG. 2 is a right side plan view of the clock design;

FIG. 3 is a front horizontal plan view of the design;

FIG. 4 is a rear horizontal plan view of the design;

FIG. 5 is a top plan view of the design; and,

FIG. 6 is a bottom plan view of the design. 

I claim the ornamental design for a clock, as shown. 